Undocumented immigrants recently released from detention prepare to depart a bus depot for cities around the country in McAllen, Texas, U.S. LOS FRESNOS, Texas - Luis Campos, a Dallas attorney, showed up at a Texas immigrant detention facility close to the U.S.-Mexico border on Wednesday morning expecting to represent a client before an immigration judge. But his client - a mother who had been separated from her child by immigration authorities after they crossed the border illegally - was not at the Port Isabel Detention Center.